Bifunctional Flexible Fabrics with Excellent Joule Heating and Electromagnetic Interference Shielding Performance Based on Copper Sulfide/Glass Fiber Composite
Flexible and wearable electronic technology is in great demand with the rising of smart electronic systems. Among this, exploring multifunctional with high performance at low cost has attracted extensive attention of scholars from the practical application perspectives. However, fabricating devices with multifunctionality without sacrificing their connatural flexibility advantages remains a huge challenge. In this study, the CuS modified glass fiber firstly act as bifunctional wearable electronics for superior thermal management and electromagnetic interference (EMI) shielding. Specifically, the inherent glass fiber was initially modified with silane coupling agent for the amino group (-NH2) functionalization followed by further CuS deposition via a facile electroless plating technology. Interestingly, due to the strong interaction between CuS and glass fiber through the coordinate -NH2 and Cu2+, the prepared copper sulfide/glass fibers (CuS/GFs) not only keep the inherent flexibility and lightness of the fiber substrate, but also has excellent electrothermal conversion performance accompanied by wide temperature range (38 oC-209 oC), low working voltage (0.3 V-1.5 V), rapid response time (reaching 209 oC within 10 s at 1.5 V). Moreover, the prepared CuS/GFs textile also exhibit interesting electromagnetic interference shielding efficiency (EMI SE) of 61 dB as well as high specific shielding effectiveness up to 6130.65 dB cm2 g-1 with the CuS mass loading of 9.95 mg cm-2. These features confirm the potential of CuS/GFs as a flexible, wearable, and efficient electrical heaters and EMI shielding material for the new type of intelligent electronic devices.